Floor furnace grill guard



FIG. 1 is a top plan view of a floor furnace grill guard showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a side elevational view thereof, the view from the opposite side being a mirror image;

FIG. 4 is an end elevational view thereof, the view from the opposite end being a mirror image; and,

FIG. 5 is a perspective view, to a larger scale, thereof. 

The ornamental design for a floor furnace grill guard, as shown and described. 